Kiln-heating device



Jan. 15 1924.

- www W. WARD KILN HEATING DEVICE Filed June 29. 1923 2 Sheets-Sheet l u. dtbozwms er J6 Jan. l5 1924a Lf l VV.vVUQD KILN HEATING DEVIGE Filed June 29. 1925 2 Sheets-Sheet? gin/venice sa? @WM Y@ Batented dan. i5, 1924.

narra ears WILBURT WARD, F TRIDENT, MONTANA..

KILN-HETNG DEVICE.

Application 1ed June 29, 1923. Serial No. 643,448.

To all whom t may concern.'

Be it known that I, WILBURT WARD, a citizen of the United States, residing at rfrident, in the county of Gallatin and State of Montana, have invented certain new and useful Improvements in Kiln-Heating Devices, of which the following is a specification.

The invention relates to kilns, and has as an object the provision of a kdevice to heat a kiln, which device is provided with a refractory brick lining, which may be renewed without disturbing the lining of the kiln. A further object of the invention is the provision of a device for preheating air and injecting steam thereinto so as to produce in the re box a water gas as an aid to combustion. A further object of the invention is to improve the device disclosed in my Patent 906,174, dated December 8, 1908.

in illustrative embodiment of the invention is shown in the accompanying drawings, in which- Fig. 1 is a central vertical longitudinal i' section of a furnace with a portion of a kiln shown partly broken away.

Fig. 2 is a horizontal section looking upward, taken on line 2, 2 of Fig. 1.

Fig. 3 is a vertical transverse sectiony on broken line 3, 3 of Fig. 1.

Fig. 4 is a detail side elevation of a refractory brick arch for the furnace, and

Fig. 5 is an end view from the left in Fi 1 of the refractory brick lining shown in ig. 4 and of the support for the lining of the kilns.

The design is specially designed for use in connection with lime or brick kilns. A portion of the kiln is shown at 10, which kiln has a brick lining 11 into which the furnace 12 opens. The furnace is shown as comprising a refractory brick arch 13, grate bars 14, an ash pit 15 and an ash door 16. A re door for feeding fuel to the furnace will be supplied at 17.

rJlhe arch 13 in a4 device of this nature, which is subjected to a high degree of heat, is the portion which first deteriorates and which must be renewed several times during the life of the whole apparatus. In devices as before constructed, the removal of the arch 13 has resulted in 'da-mage to the lining 11 of the kilns. To support the lining 11 there is provided by the present invention a supplemental arch 18 which is constructed flush with the interior of the lining l1 where its wings 19 intersect the wall of the lining and which may be made in its,outer configuration, as shown in Fig. 5. The arch 13 may be removed from under the'arch. 19 @0 and from under the brick arch 20, which covers the refractory arch, without disturbance of the superposed structure, and a new refractory arch may be installed.

In the assembly of the structure, the arch 13 is first set up, sheets of asbestos paper 20 are laid over the same, closing the Aair channels therein, and then the arch 20 is con structed, covering the whole. rlhe purpose of the asbestos paperis to prevent mortar terial of the arch 20 from the heat of the 75 air flowing through the air channels.

An object of the structure shown in my former patent above referred to is to cool the material forming lthe refractory arch 13,

so as to check its deterioration, and also to @c preheat the air delivered to the space below the fire. According to the embodiment` shown of the present invention, the air channels 21, 22, 23, 24 are moulded into the body of the units comprising the arch, and by @s this plan it is possible to make the shell comprising the body of the arched brick thinner than by theplan followed in the structure of the former patent, since in the former. patent the shell referred to must be D0 of such a thickness as to support the separate units forming the partitions 25, 26, 27, 28,29, 30, 31 and 32, between the channels,

which partitions in the structure referredto y carried the weight of the superposed arch.

Since the portion of the arch 13 occurring under the arch 18 is exposed to the highest degree of heat in the furnace, and, in addition, has the weight of the arch 18 and of the lining 11 above it, it is preferred to make to@ the unit 33 comprising this arch thicker than the other units of the refractory lining.

The course of the air iowing through the channels 21 to 24 inclusive, which air is admitted through a pipe 34, is shown by the its arrows in Fig. 4. Of the partitions between the channels, the partitions 26 and 30 in the portion of the arch toward the observer in Fig. 4, are extended to prevent communication between thepchannels 21 and 22, and im@ between the channels 23' and 24, at the side of the arch, toward the observer, in said figure, and the partition 28 extends so as to prevent access between channels 22 and 23 at the side of the arch opposite the observer in Fig. 4, as indicated by the dotted lines in said figure. There is free communication between the channels 21 and 22, and between the channels 23 and 24 at the side of the arch opposite the observer, in Fig. 4, as shown by the dotted lines in the figure, indicating the termination of partitions 26 and 30, at the opposite side.

The position of the air pipe 34 for introducing a supply of air into the air channels is indicated by dotted lines on Fig. 4, and is shown in Fig. 2. These channels being in the hottest part o-f the arch and receiving the coldest air will therefore receive a maximum cooling effect from the device, and will start to raise the temperature of the, air in the most prompt manner upon its introduction. The course of the air is through the channels 21, around the partition 30, through the channel 24 in parallel around the partition 28, through the channels 23 in parallel, around the partition 30, through the channel 24 in parallel7 and out at the air pipe 35, which discharges the air into the ash pit 15 below the grate for the same into the ash pit To provide a forced feed for the air, as well as tb introduce steaml thereinto to assist the combustion, there is shown a steam pipe 36 ending in a jet and discharging into the channels 23 in the position shown in dotted lines in Figif4. By injecting the steam at this point, rather than at the point shown by my former patent, the force feed upon the air isf/applied at a median point in its course, and is therefore more effective and, in addition, the air and steam have a considerable length of channel to traverse after the introduction of the steam, which results in a thorough mixing of the two, and also the subjection of the mixture to the heat in channels 23 and 24 before the same is dis,- charged in the ash pit. As the result of this change the mixture of air and steam is thoroughly homogeneous, and is heated to a sufficiently high temperature as to enable the fire, as I believe, to disassociate the steam into its constituent parts, and therefore to provide oxygen for combustion and combustible hydrogen to aid in the combustion of the fuel in the furnace.

Minor changes may. be made in the physical embodiment of the invention withou departing from its spirit.

I claim: i

1. A kiln having a lining, a furnace therefor opening into said kiln, a refractory arch lining for said furnace and a supplemental arch above said furnace lining acting as a support for the lining of the kiln when the furnace arch is removed.

2. A kiln having a lining,.a furnace therefor comprisingv a combustion chamber, a refractory arch for said chamber comprising arch units, air channels mouldedin vthe material of said units and having partitions therebetween, certain of said partitions eX- tending to the end of said channels to act as baffles inthe passage formed bysaid channels and a supplemental arch above said refractory arch acting as a support for the lining of the kiln when the former arch is removed.

3. A kiln having alining, a furnace therefor comprising a chamber, an arch for said chamber, air channelsl in said arch extending transversely thereof, certain of said channels communicating adjacent to thel spring yof the arch to provide a tortuous passage through said channels, means for admitting air to said channels at one end of the arch, means for admitting steam to,

said channels at an intermediate portion of the arch to provide a forced feed of a mixture of steam and air, means for conducting the air from the channels adjacent the remaining end of the arch to the burning fuel in the furnace and a supplemental arch above said firstv named arch acting as a.

support for the lining of the kiln when the first named arch is removed for repairs. WILBURT WARD. 

